diff --git a/calculator.cpp b/calculator.cpp
index d93e35b..7e4c545 100644
--- a/calculator.cpp
+++ b/calculator.cpp
@@ -9,3 +9,8 @@ int Calculator::Sub (double a, double b)
 {
     return Add (a, -b);
 }
+
+int Calculator::Mul (double a, double b)
+{
+    return a * b + 0.5;
+}
diff --git a/calculator.h b/calculator.h
index 3740907..fdf5ddd 100644
--- a/calculator.h
+++ b/calculator.h
@@ -6,6 +6,7 @@ class Calculator
     public:
         int Add (double, double);
         int Sub (double, double);
+        int Mul (double, double);
 };
 
 #endif//CALCULATOR_H